Due to MI, a first-order breather solution describe the development of a pair of sidebands as a perturbation on a constant background making a periodic train of pulses [1]}. Similarly, two pair of sidebands will also grow and will be developed into a general two-breather solution following the nonlinear superposition mechanism. However, in that case both pair of initial sidebands must remain within the instability band. General expression for a breather solution of any order of Eq.(REF ) can conveniently given by the expression:
\(\psi _n(x,t)=\left((-1)^n+\frac{G_n+i \,H_n}{D_n}\right) e^{i x}\) 
